e686a13b7b
Task-number: QTBUG-106893 Change-Id: Id0f558362108fedececb9eede36becc04ff4e307 Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "peerwireclient.h"
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#include "ratecontroller.h"
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#include <QtCore>
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Q_GLOBAL_STATIC(RateController, rateController)
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RateController *RateController::instance()
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{
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return rateController();
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}
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void RateController::addSocket(PeerWireClient *socket)
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{
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connect(socket, &PeerWireClient::readyToTransfer,
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this, &RateController::scheduleTransfer);
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socket->setReadBufferSize(downLimit * 4);
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sockets << socket;
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scheduleTransfer();
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}
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void RateController::removeSocket(PeerWireClient *socket)
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{
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disconnect(socket, &PeerWireClient::readyToTransfer,
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this, &RateController::scheduleTransfer);
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socket->setReadBufferSize(0);
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sockets.remove(socket);
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}
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void RateController::setDownloadLimit(int bytesPerSecond)
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{
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downLimit = bytesPerSecond;
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for (PeerWireClient *socket : std::as_const(sockets))
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socket->setReadBufferSize(downLimit * 4);
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}
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void RateController::scheduleTransfer()
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{
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if (transferScheduled)
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return;
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transferScheduled = true;
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QTimer::singleShot(50, this, &RateController::transfer);
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}
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void RateController::transfer()
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{
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transferScheduled = false;
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if (sockets.isEmpty())
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return;
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qint64 msecs = 1000;
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if (stopWatch.isValid())
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msecs = qMin(msecs, stopWatch.elapsed());
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qint64 bytesToWrite = (upLimit * msecs) / 1000;
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qint64 bytesToRead = (downLimit * msecs) / 1000;
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if (bytesToWrite == 0 && bytesToRead == 0) {
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scheduleTransfer();
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return;
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}
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QSet<PeerWireClient *> pendingSockets;
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for (PeerWireClient *client : std::as_const(sockets)) {
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if (client->canTransferMore())
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pendingSockets << client;
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}
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if (pendingSockets.isEmpty())
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return;
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stopWatch.start();
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bool canTransferMore;
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do {
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canTransferMore = false;
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qint64 writeChunk = qMax<qint64>(1, bytesToWrite / pendingSockets.size());
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qint64 readChunk = qMax<qint64>(1, bytesToRead / pendingSockets.size());
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for (auto it = pendingSockets.begin(), end = pendingSockets.end(); it != end && (bytesToWrite > 0 || bytesToRead > 0); /*erasing*/) {
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auto current = it++;
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PeerWireClient *socket = *current;
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if (socket->state() != QAbstractSocket::ConnectedState) {
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it = pendingSockets.erase(current);
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continue;
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}
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bool dataTransferred = false;
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qint64 available = qMin<qint64>(socket->socketBytesAvailable(), readChunk);
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if (available > 0) {
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qint64 readBytes = socket->readFromSocket(qMin<qint64>(available, bytesToRead));
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if (readBytes > 0) {
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bytesToRead -= readBytes;
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dataTransferred = true;
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}
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}
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if (upLimit * 2 > socket->bytesToWrite()) {
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qint64 chunkSize = qMin<qint64>(writeChunk, bytesToWrite);
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qint64 toWrite = qMin(upLimit * 2 - socket->bytesToWrite(), chunkSize);
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if (toWrite > 0) {
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qint64 writtenBytes = socket->writeToSocket(toWrite);
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if (writtenBytes > 0) {
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bytesToWrite -= writtenBytes;
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dataTransferred = true;
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}
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}
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}
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if (dataTransferred && socket->canTransferMore())
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canTransferMore = true;
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else
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it = pendingSockets.erase(current);
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}
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} while (canTransferMore && (bytesToWrite > 0 || bytesToRead > 0) && !pendingSockets.isEmpty());
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if (canTransferMore || bytesToWrite == 0 || bytesToRead == 0)
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scheduleTransfer();
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}
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